ENGINE
C. FUEL FEED PUMP
The filtered fuel is fed to the injection pump by the
fuel transfer pump. The diaphragm(6) is linked to the
tappet(3) with the push rod(2). The tappet is
reciprocated by the eccentric cam on the fuel
c a m s h a f t ( 7 ) .
(A) Inlet Stroke
When the diaphragm is pulled down by the spring,
vaccum in the chamber(5) causes the outlet
valve(4) to close and the atmospheric pressure in
the fuel tank to force the fuel into the chamber,
opening the inlet valve(4).
(B) Discharge Stroke
When the diaphragm is pushed up by the cam, the
pressure in the chamber causes the inlet valve to
close and forces out the fuel, opening the outlet
v a l v e .
D. FUEL INJECTION PUMP
The injection pump is Bosch K type mini injection
pump. It features a compact and lightweight design.
(a) To Injection Pump
(b) Front Fuel Feed Pump
(1) Delivery Valve Holder
(5) Plunger
(2) Delivery Valve Spring
(6) Control Rack
(3) Delivery Va l v e
(7) Plunger Spring
(4) Cylinder
(8) Ta p p e t
a. Pump Element
The pump element(1) consists of a plunger(3) and
cylinder(2), their sliding surfaces are precision
machined to maintain fuel tightness. The plunger(3)
fits in the control sleeve(5) at the driving face(7). The
sleeve is engaged with the control rack, which rotate
the plunger in the cylinder to control the amount of
fuel delivery.
(1) Pump Element
(5) Control Sleeve
(2) Cylinder
(6) Control Groove
(3) Plunger
(7) Driving Surface
(4) Feed Hole
(a) From Fuel Filter
(b) To Injection Pump
(1) Inlet Valve
(2) Push Rod
(3) Tappet
(4) Outlet Valve
(5) Chamber
(6) Diaphragm
(7) Fuel Camshaft
